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TUSB4041I: PC doesn't recognize the TUSB4041I

David Arlandi
Prodigy 60 points
Part Number: TUSB4041I

Hello team!

I have a problem with my USB HUB TUSB4041I, I have made a custom PCB and when I connect it to my computer (windows 10), a message appears with the error "the device is not recognized"

Here is the schematic, do I have something wrong?

Regards!

  • 0
    TI__Guru 60870 points

    Hi David,

    Can you check if there is a clock on XI?  The datasheet for that oscillator lists VDD at 3.3V?

    Also, please check voltage levels on upstream DP/DM.

    Regards,

    JMMN

  • 0 in reply to JMMN
    Prodigy 60 points

    You were right about the 3.3v for the oscillator, I have changed the voltage (cutting the trace and soldering a wire to 3.3v) but the issue persist (I have replaced it for it was bad). My oscilloscope is cheap and doesn't read the frecuency of 24Mhz, so I cannot check it.

    The voltage levels on upstream DP/DM is 0.3v in DP and 0v in DM. And the current consumption when I connect the board is about 150mA, which I think is too much (and there are no devices connected to the hub, only the upstream port)

    Regards!

  • 0 in reply to David Arlandi
    TI__Guru 60870 points

    Hi David,

    Can you confirm that the hub doesn't have SMBUSz pulled low, that would put the hub in programming mode.  Also, can you confirm that there is a thermal pad under the hub connected with vias?

    Regards,

    JMMN

  • 0 in reply to JMMN
    Prodigy 60 points

    Hi JMMN!

    Finally I solved the problem, I re-solder another board with new components and all was ok with the modification of 3.3v to the oscillator.

    Thank you very much for your help.

    Regards!